Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-04-04
Chin.Phys.Lett.24:1417-1421,2007
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures, paper accepted for publication in Chinese Physics letters
Scientific paper
10.1088/0256-307X/24/5/081
The star HE 1305-0007 is a metal-poor double-enhanced star with metallicity [Fe/H] $=-2.0$, which is just at the upper limit of the metallicity for the observed double-enhanced stars. Using a parametric model, we find that almost all s-elements were made in a single neutron exposure. This star should be a member of a post-common-envelope binary. After the s-process material has experienced only one neutron exposure in the nucleosynthesis region and is dredged-up to its envelope, the AGB evolution is terminated by the onset of common-envelope evolution. Based on the high radial-velocity of HE 1305-0007, we speculate that the star could be a runaway star from a binary system, in which the AIC event has occurred and produced the r-process elements.
Cui Dong-Nuan
Cui Wen-Yuan
Du Y. S.
Zhang Baigang
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